package com.xuenci.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.rabbitmq.client.Channel;
import com.xuenci.common.exception.NoStockException;
import com.xuenci.common.to.mq.OrderTo;
import com.xuenci.common.to.mq.StockDetailTo;
import com.xuenci.common.to.mq.StockLockedTo;
import com.xuenci.common.utils.R;
import com.xuenci.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.xuenci.gulimall.ware.entity.WareOrderTaskEntity;
import com.xuenci.gulimall.ware.feign.OrderFeignService;
import com.xuenci.gulimall.ware.feign.ProductFeignService;
import com.xuenci.gulimall.ware.service.WareOrderTaskDetailService;
import com.xuenci.gulimall.ware.service.WareOrderTaskService;
import com.xuenci.gulimall.ware.vo.OrderItemVo;
import com.xuenci.gulimall.ware.vo.OrderVo;
import com.xuenci.gulimall.ware.vo.SkuHasStockVo;
import com.xuenci.gulimall.ware.vo.WareSkuLockVo;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xuenci.common.utils.PageUtils;
import com.xuenci.common.utils.Query;

import com.xuenci.gulimall.ware.dao.WareSkuDao;
import com.xuenci.gulimall.ware.entity.WareSkuEntity;
import com.xuenci.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("WareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    OrderFeignService orderFeignService;

    /**
     * 1、库存自动解锁
     * 下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要解锁
     * 2、订单失败。
     * 锁库存失败
     * <p>
     * 只要解锁库存的消息失败，一点要告诉服务解锁失败。
     */

    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        wareSkuDao.unLockStock(skuId, wareId, num);
        // 更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);  // 变为已解锁
        orderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");

                if (info.getCode() == 0) {
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }
            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();

            // 查询当前sku的总库粗量
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }

    /**
     * 为某个订单锁定库存]
     *
     * @param vo 库存解锁场景
     *           1）、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     *           2）、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。
     *           之前锁定的库存就要解锁
     * @return
     * @Transactional(rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        // 1、按照下蛋的收货地址，找到一个就近的仓库，锁定库存

        // 1、找到每个商品在那个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            // 查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        Boolean allLock = true;
        // 锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                // 没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            // 1、如果每一个商品都锁定成功，当前商品锁定了基建的工作单记录发给MQ
            // 2、锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以不用解锁

            for (Long wareId : wareIds) {
                // 成功就返回 1，否则就返回 0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    // 成功
                    skuStocked = true;
                    // todo 告诉mq库存锁定成功
                    WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(taskDetailEntity);

                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity, stockDetailTo);
                    // 只发id不行，防止回滚以后找不到数据
                    lockedTo.setDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    // 当前仓库锁失败，重试下一个仓库
                }
            }
            if (skuStocked == false) {
                // 当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        // 肯定全部都是锁定成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        // 库存工作单的id
        StockDetailTo detailTo = to.getDetailTo();
        Long detailId = detailTo.getId();
        // 查询数据库关于这个订单的锁定库存信息
        // 有：证明库存锁定成功了
        //      解锁：订单情况
        //          1、没有这个订单。必须解锁
        //          2、有这个订单。判断订单状态
        //              订单状态 已取消：解锁库存
        //                      没取消：不能解锁
        // 没有，库存锁定失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            // 解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); // 根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                // 订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    // 订单不存在或者订单被取消了,解锁库存
                    if (byId.getLockStatus() == 1){
                        // 当前库存工作单详情，状态1  已锁定但是未解锁才可以解锁
                        unLockStock(detailTo.getSkuId(), detailTo.getWareId(), detailTo.getSkuNum(), detailId);
                    }
                }
            } else {
                // 消息拒绝以后重新放到队列里面，让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }

        } else {
            // 无需解锁
        }
    }

    // 防止订单服务卡顿，导致订单状态一直改不了，库存消息优先到期。查订单是新建状态。什么都不做就走了，
    // 导致卡顿的订单，永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        // 查一下最新库存解锁的订单状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        // 按照工作单找到所有 没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
                        .eq("task_id", id)
                        .eq("lock_status", 1));
        // Long skuId, Long wareId, Integer num, Long taskDetailId
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}